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Costin was an engineer with the de Havilland Aircraft Company when, in 1954, his brother Mike, a former de Havilland engineer then working for Lotus Engineering Ltd., asked him to design an aerodynamic body for a new racing car. Intrigued by the idea of applying aerodynamics to racing cars, Costin designed the body for the Lotus Mark VIII[1] Unlike his brother, Costin was never a Lotus employee; his work there was either as a paid consultant or as a volunteer.[2]

In 1956, when Chapman was commissioned by Tony Vandervell to design a Grand Prix racing car to challenge Maserati and Ferrari dominance of the formula, Chapman recommended Costin to Vandervell as the body designer. Costin designed the body for the Vanwall that won the first Grand Prix Constructors' Championship.[1]

^Schreiber, Ronnie (23 June 2010). "title= Book Review: Colin Chapman: Inside The Innovator". The Truth About Cars. Retrieved 2012-07-21. Frank Costin, Mike’s brother, was an aerodynamicist for deHavilland and Chapman’s first aero guru (Peter Wright would later fill that role with the ground effects cars), but Frank Costin never was a Lotus employee, preferring to work either for consultant fees or gratis just to see his ideas tested.